A Comparative Analysis of the Physiological Condition of Cirrhinus reba, Reba Carp (Day, 1878) of Dhepa and Atrai Rivers, Dinajpur District, Bangladesh

Abstract

Background: Bangladesh is enriched with huge water bodies which are considered as the gold mines fisheries sector as well as national economy. The main rivers of Dinajpur districts are: Dhepa, Punarbhaba and Atrai. Aims: The study aims to investigate the health condition of Cirrhinus reba in Dhepa and Atrai river of Dinajpur district by evaluating the water quality parameters, body indices and haematological parameters. Methodology: Nine fishes were randomly collected from each source for determining the body indices (hepatosomatic index, intraperitoneal fat and viscerosomatic index) and haematological parameters analysis (haemoglobin, red blood cell, white blood cell count, total platelet count, differential leucocyte count and erythrocyte sedimentation rate). The study was conducted in the Dhepa River near Hajee Mohammad Danesh Science and Technology University, Dinajpur and the Atrai River near Mohanpur Bridge, Dinajpur, for six months from October 2019 to March 2020. Fish sampling and water quality parameters (air and water temperature, depth, transparency, pH, dissolved oxygen, alkalinity and hardness) were monitored monthly. Results: The highest air and water temperatures were recorded in October, while the lowest were found in December in the Dhepa and Atrai rivers. The highest transparency and pH were observed in January in the Dhepa and Atrai rivers, while the lowest were recorded in October and November, respectively. The body indices result revealed that HSI (0.04-0.09%), IPF (0.17-1.47%) and VSI (14.25-20.38%) of C. reba were observed in both Dhepa and Atrai rivers. The lowest WBC, lymphocyte and monocyte counts were found in the blood of C. reba collected from both sources in December, while the highest total platelet count and ESR were recorded from the fish collected from the Dhepa River only in October. The highest levels of Hb, WBC and lymphocyte count were observed between February and March 2020 in both the Dhepa and Atrai rivers. Conclusion: It can be said that the health condition of C. reba collected from both sources are apparently healthy, and better haematological parameters were observed in the months of February and March 2020.